As an urban user, I love a cashless society, because the use of cryptocurrencies in a bank account is helping:
+ reduce the cost of printing money/coin;
+ limit contact between people during a pandemic;
+ prevent counterfeiting money;
However, the majority of the world's population is still living in difficult conditions, they do not have the chance to come into contact with cryptocurrencies or cryptocurrencies, they still need cash to pay.
In Vietnam, only large supermarkets or chain stores support bank card payments, people are not ready to receive bank cards, the same thing happens with crypto.
So I think that a cashless economy has many benefits but can only serve a small number of users, we still need cash & fiat.